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- Q2317672 subject Q6462897.
- Q2317672 subject Q7137748.
- Q2317672 subject Q7165057.
- Q2317672 abstract "The Winkler test is used to determine the concentration of dissolved oxygen in water samples. Dissolved oxygen (D.O.) is widely used in water quality studies and routine operation of water reclamation facilities. An excess of manganese(II) salt, iodide (I−) and hydroxide (OH−) ions is added to a water sample causing a white precipitate of Mn(OH)2 to form. This precipitate is then oxidized by the dissolved oxygen in the water sample into a brown manganese precipitate. In the next step, a strong acid (either hydrochloric acid or sulfuric acid) is added to acidify the solution. The brown precipitate then converts the iodide ion (I−) to iodine. The amount of dissolved oxygen is directly proportional to the titration of iodine with a thiosulfate solution. Today, the method is effectively used as its colorimetric modification, where the trivalent manganese produced on acidifying the brown suspension is directly reacted with EDTA to give a pink color. As manganese is the only common metal giving a color reaction with EDTA, it has the added effect of masking other metals as colorless complexes.".
- Q2317672 wikiPageExternalLink 4oxygen.html.
- Q2317672 wikiPageExternalLink ap12pg11.htm.
- Q2317672 wikiPageExternalLink ap12pg3.htm.
- Q2317672 wikiPageExternalLink ap12pg7.htm.
- Q2317672 wikiPageExternalLink dissolved_oxygen.pdf.
- Q2317672 wikiPageExternalLink www.standardmethods.org.
- Q2317672 wikiPageWikiLink Q10876.
- Q2317672 wikiPageWikiLink Q1103.
- Q2317672 wikiPageWikiLink Q113796.
- Q2317672 wikiPageWikiLink Q11982.
- Q2317672 wikiPageWikiLink Q121874.
- Q2317672 wikiPageWikiLink Q132298.
- Q2317672 wikiPageWikiLink Q184755.
- Q2317672 wikiPageWikiLink Q191010.
- Q2317672 wikiPageWikiLink Q193793.
- Q2317672 wikiPageWikiLink Q213185.
- Q2317672 wikiPageWikiLink Q215624.
- Q2317672 wikiPageWikiLink Q2409.
- Q2317672 wikiPageWikiLink Q408032.
- Q2317672 wikiPageWikiLink Q409393.
- Q2317672 wikiPageWikiLink Q410739.
- Q2317672 wikiPageWikiLink Q4118.
- Q2317672 wikiPageWikiLink Q5447188.
- Q2317672 wikiPageWikiLink Q629.
- Q2317672 wikiPageWikiLink Q6294669.
- Q2317672 wikiPageWikiLink Q641462.
- Q2317672 wikiPageWikiLink Q6462897.
- Q2317672 wikiPageWikiLink Q6474477.
- Q2317672 wikiPageWikiLink Q657709.
- Q2317672 wikiPageWikiLink Q7137748.
- Q2317672 wikiPageWikiLink Q7165057.
- Q2317672 wikiPageWikiLink Q731.
- Q2317672 wikiPageWikiLink Q82682.
- Q2317672 wikiPageWikiLink Q912751.
- Q2317672 comment "The Winkler test is used to determine the concentration of dissolved oxygen in water samples. Dissolved oxygen (D.O.) is widely used in water quality studies and routine operation of water reclamation facilities. An excess of manganese(II) salt, iodide (I−) and hydroxide (OH−) ions is added to a water sample causing a white precipitate of Mn(OH)2 to form. This precipitate is then oxidized by the dissolved oxygen in the water sample into a brown manganese precipitate.".
- Q2317672 label "Winkler test for dissolved oxygen".